It is turn 14 in the campaign game and the Germans have a number of air groups with morale of 10 but much higher experience. These are level and tactical bombers. The fighters are generally in the 90s. Is this typical? I have 40% required to fly and most missions at 50%.

Morale drops from over use, particularly with dive bombers when I was playing German, on game release. The weeks you pass with them all in reserve will be painfully long, so best to keep tabs on morale every week and cycle them so you always have some available.

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“The end of democracy and the defeat of the American Revolution will occur when government falls into the hands of lending institutions and moneyed incorporations.” ¯ Thomas Jefferson

Yep, it is normal - sadly. As far as I have understood fighter squadrons gain morale if they shoot down enemy planes and lose when they have their planes shot down. This of course is biased against the bombers, as they practically only lose planes.